<button type="button" class="btn btn-secondary" placement="top"
        ngbPopover="Vivamus sagittis lacus vel augue laoreet rutrum faucibus." popoverTitle="Popover on top" 
        #popover="ngbPopover">
  Open Popover
</button>

<hr />

<p>
  Popover is currently: <code>{{ popover.isOpen() ? 'open' : 'closed' }}</code>
</p>
